Game Over Manga by Fuka Mizutani

Contains a main story and 3 oneshots.
Main Story: Game Over
A businesswoman plays a game on the bus to find one boy who seemingly isn't affected by her charms.
Side Story 1: Yuukai no Susume (Advice for Kidnapping)
A pair of siblings are having a hard time forgiving their dad for abandoning them.
Side Story 2: Kedama no Cake
Kedama's cake shop doesn't get much business, until a yankee decides to apply for a job there to become more feminine.
Side Story 3: Kinou Kenka wo Shimashita
Two friends try to resolve a misunderstanding they had the day before.